Production of phonographic sound-records.



2 SHEETS-SHEET 1.

AIn ventor No. 834,485. PATENTRD 00T. 3o, 1906.

' W. F. NRHR.

PRODUCTION 0F PHONOGRAPHIG SQUND RECORDS.

APPLICATION FILED SEPT. 9.1905.

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VAttest: l ff No. 834,485. PATBNTBD 00130, 190s'.

w. P. NBER.

PRODUCTION -OP PHONOGRAPHIC SOUND RECORDS.

` ArrLloA'rIol rninn snr1.o.19o5.

' a sums-anun.

Essex and State of New Jersey, have in- UNITEDSTATES .PATENT OFFICE. WU-T ;AM E. NEHR, E NEWARK, .NEW JERSEY, AssieNoR vTo NEW JERSEYY PATENT COMPANY, 0E WEST ORANGE, NEW JERSEY, A coRPoRATioN 0F NEW JERSEY. i

PRODUCTION oF PHNQGRAPHIC sown-RECORDS.

Specification of Letters Patent.

l Patenta oct. 3o, 190e.

Application filed September 9. 1905. Serial No. 277.800.

To all whom may concern: l, i

Be it known that I, WILLIAM FRANK NEHR, a resident of Newark, in the county of vented ,certain new and useful Improvements in' theProduction of Phonographic Sound-Records, of which the followingis a description. f f1', -v

My invention relates to apparatus for use in the molding .of phonographic sound-records, and more particularly tol apparatus for carryin, out. a molding process described. und clalmed in United States Letters Patent No. 683,615, dated October 1, 1901, to Miller and Aylsworth, whereina tubular mold iscaus'ed to descend into a bath of molten material, which fills thesame and congeals upon its interior in a coatin or layer,

- which adheres tothe same while tIie mold is lifted out lof the bath, after which the record may -be finishedy upon Aits interior surface and removed from the mold by radial contraction or shrinkage.

Heretofore in producing records accord? ing to this process it has not been possible to nmlii the upper end of the record to theshape desired in Lthe finished article, the practice being to form' a rough end which must after# Ward be removed-iin any suitable manner, as

by a cutter or trimmer of any suitable descriptionv s My invention vhas for its object thel provision of means whereby 'such u per end may be molded into a form suitab e for the finished article-that is, a surface which will present a smooth and polished appearance and which will be .free from depressions, elevations discolorations, and all forms of roughness or irregularity. With this end in View I have made a large number of experi ments to4 obtain a mold-capl which when placed upon a tubular coreless mold will be.'

`*capable of molding the upper end of the sound-record in the maiinerreferred to for 4S an indefinite number ofA operations. From these experiments I have determined that the mold-cap vshould have'a concave surface,

tlfe outer edge ofl which during the molding operation adjoins and forms a continuation of the bore of the mold. Preferably the `body of the mold should extend above at least the lower; art ef Asaid concave surface,

. so that Whent e-cap is removed from the pliGate. permit the molten material used for formini i mold the molded end of the record or that portion which forms the end after the reamying operationv will beprotected by the mold a vainst accidental injury during vthe hand in ofthe same prior tothe removal fof the nis ied article fromthe mold. I have also determined that the said concave surface may be of such form as to entrap a portion of the-air contained in the bore of the mold as the same' descends into the molten material, `1n which case the air is permitted to es-y l cape through air-holes extending through the body of the mold-cap. I have also obtained good results by providing. a` second' groove concentric with the first groove and separated therefrom by a partition which tapers to a comparatively sharp edge.. I

have also discoveredA 'that the concave surface should bel perfectly smooth and highly Y polished and preferably nickelplated, and

also that'the mcld-cap should be kept cool 'I during the molding operation, -as by providing the same with awater-jacket.

'My invention consists in the features hereinafter described and claimed. l

Reference is hereby made to the accom panying drawings, in which'-` Figure l lis 'a vertical section showing a mold sup cited in a mold-carrier and surrounded by a water-jacket in the usual manner and provided with a cap constructed in accordance with my invention. Fig. 2 is Aan elevation, on an enlarged scale, ofthe mold-capshownin Fig. 1. Fig. 3 is a bottom plan -view of FigLZ, and Fig. 4 is atop plan viewv of the same.

. In all theviews corres ending parts are designated `bythe same re terence-numerals.

' In carrying'out the process of Patent No.

f 683,615, above referred to,.the usual pracltice is to provide a tubular mold 1, carry-ing upon its interior surface a negative copy the 'seundaecord which itis desired-to du- Thismold is open at the bottom to the ,duplicate to enter the mold, the mold be ing supported by a suitable carrier or su? port 2, which is provided with a seat 3 for the lower end of the mold and an openinge `toall'ow the inoltenmaterial toenter the' mold. A vremovable water-jacket ,5 sulM rounds the meld in order to keep the sanicat. a temperature considerably below thatof tlle' am c nrolten mixture. The parts thus described, speaking broadly, are well known in this artand form no part of my invention. The particular form of mold illustrated is believed to be novel, however. and is described and claimed in an appli sation of Edward L. Aiken filed October 12, 19m?. Serial No. 282,365.

The mold-cap 6 consists of a circular body of a .size suitable-to lit within the upper end of the mold 1 and close the same. Tne lower surface of thisA ca p is llfrovided with two circu lar grooves 7 and A central opening Q extends through the body of the cap. The outer surface of the groove '7 is so situated as to form a continuation of the interior surface of the mold 1. At' the deepest portion of the groovo' is a small il-shaped groove 9, and

cornmunicaiing with said groove 9 are a largcnumbcr of air-holes v1t), which extend through thebody of the cap 6. The grooves 7 and are separated by a web or partition 11, whoselower edge is comparatively sharp andjoccn pies substantially the same-horizontal plant/as the outer edge ofthe groove 7 amt-inner edge of the groove The cap 6 may lie-:constructed of any suitable metal or alloy, such as brass, and its entire lower surface is highly polished and nickel-plated, so as to present at all times a bright untarnished surface. The cap 6 is provided with a vcurv ed rod 12;' by which it may be conveniently handled. The cap 6 is also provided with4 aj water-jacket 13, preferably integral therewith, and is supplied with water through a fiexible -tube 16 and an'inlet-pipe 111, the water leaving the jacket through an exit-pipe 15 and flexible tube 17.

In molding a record with the apparatus shown the temperature of thewax and the duration and'immersion of the mold will be such that the mold will receive upon its .interior surface a coating of congealed wax 18.-

Upon removingthe mold from the bath of molten material the said coating adheres to.

the mold, and as soon as the wax has cooled sufficiently the cap 6 may be removed by a longitudinal movement and theneck` 19 of the molded article may be removed by giving it a slight twist, whereupon it breaks oifgen orally at or near the point 20. The interior of the record is then reamed out by .a proph orly-shaped knife, whilethe wax is still soft, so that its interior surface assumes the shape indicated by dotted ,lines 21. it will be noted that the line 21 falls just outsideof the groove '9 and air-holes 10, so that any impression which may have been produced by these parts will not appear upon the finished article. Furthermore, `that portion of the 'congealed wax from which the record is formed is entirely within the body of the mold, so as to b e protected thereby at all stages of manufacture.

'After the roaming operation the record may be removed. yfrom the mold in an entirely rounded in cross-section,

seance 'finished condition by cooling, thereby pro -ducing a relative contraction of the record with respect to the mold and then withdrawing the record from the mold by a longitudi-y nal. movement.

Having now described my invention, what I claim as new therein, and desire to .secure by Letters Patent, is as follows:

1. As a new article of uutnul'acture, a mol l cap provided with` a'circular groove rounded in cross-section and a watcijacl\:et,substantially as set forth.

2. As anew article of manufacture, a moldcap provided with adjacent concentric grooves, the outer groove having an air-pas sage extending through the body of the cap, substantially as set forth.

8. As a new article of manufacture, a moldcap provided with a water-jacket and adjacent concentric grooves, the outer groove having an air-passage extending through the body of the cap, substantially as set forth.

l 4. As a new article of manufacture, a mold cap provided` with adjacent concentric grooves, the lower edges of the outer groove occupying substantially the same horizontal plane, substantially as set forth.

5. As a new article of manufacture, a moldcap provided with adjacent concentric grooves the lower edges of said grooves occupying substantially the same horizontal 4plane, substantially as set forth.

6. As a new article of manufacture, a moldcap provided with adjacent concentric grooves, the lower edges of which occupy substantially the same horizontal plane and the outer groove having an air-passage cxtending through the body of the cap, substantially as setforth.

7 As a new article of manufacture, a moldcap provided with concentric grooves separated by a web which tapers to a con'lparativelT sharp edge, substantially as set forth.

8. As a n ew articleI of manufacture. a moldcap provided with concentric grooves separated by a web-which tapers to a comparan tively sharp edge, the outer groove having an air-passage extending through the body of the cap, substantially as set forth.

9. As a new article of manufacture, a moldcap provided with a water-jacket and with concentric grooves separated by a web which tapers to a comparatively sharp edge, substantially as set forth.

10. As a new article of manufacture, a 1nold-cap provided with a water-jacket and with concentric grooves separated by a web which tapers to a comparatively sharp edge, the outer groove having a series of air-holes, substantially as described.

.11. As a new article of manufacture, a mold-cap provided with a circular groove of said groove being. provided with a V- shaped groove and the deepest portion a series ofair-holes ex tending from said V-shaped groove through nickel-plated surfaces, substantially as set forth. v

, 14. As a new article of manufacture, a mold-cap .provided with a circular groove having a rounded, polished, nickel-plated rsurface and a series of air-holes extending therefrom through the body of the cap, sub'- stantially as set forth.

15. rlhe combination ofa tubular mold and a removable circular mold-,cap having a smooth concave surface, the outer edge of which forms `a continuation of the bore of the' mold, substantially as set forth.

16. The combination of a tubular mold and a removable circular Water-jacketed mold-cap having a smooth concave surface, the uter edge of which forms a continuation of the bore ofthe mold, substantially as set forth.

17. The combination of la tubular mold and a removable circular mold-cap having af smooth concave surface, the Outer edge of which forms a continuation of the bore of the mold, and an air-passage extending from said surface through the body of the cap, substantially as set forth. p

18. The combination'tof a .tubular mold and a removable circular mold-cap having a polished, nickel-plated concave surface, the outer edge of Which forms a continuation of the bore of the mold, substantially as set forth. l

19. The combination of a .tubular inold and a removable circular mold-cap having a smooth concave surface, the outer edge of which forms a continuatio'nof the bore of the mold, the body of the mold extending above and a reinovable circular mold-cap having a smooth concave surface, lthe outer edge of Which forms a continuation of the bore of the mold, the body of the mold extending above at least the lovver part of said concavel surface, substantially as set forth.

This specification signed and' witnessed this 5th day of September, 1905.

WILLIAM F. NEHR. Witnesses: J. F. RANDOLPH, Datos HOLDEN. 

